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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97956c6e3665ccd92890af9290c65afe22c10e1bf68a588ce588546e8b3af190' 
  AND token = 'xuBupjMW5l98u4ga1yW79P0jHgqvFIdpRkNU2s2Sgyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}