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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a39b12aa5655d4e6edf646a241e547fbf8cc4fe6e642217a4b5f142c9f54ce' 
  AND token = 'PvyvSQOdsF9l2Lf81fR4b+NwtQmCa4NPO+F4OJurFok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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