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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00eec3c2b81ab070a85605da874bb593ce65690f74d48cc10b9748c7a7fa03a' 
  AND token = 'mo6g3XZdNY49r0POga7z4xUQSIpdADnBsg82dGCHK9Q=' 
  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"
    }
  }
}