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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f997717dea26be5102da733e4baf14363e56a3adc2ae4d46f8a11424a565b196' 
  AND token = '4SWSUfpQ250cRnJvpe0pX4uOo8UPQoHADMVDAH8JQoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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