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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1e9b7500de4c19d7e33d6c08e2cda4d9ac7dce62075ddc40ed485e562244e8' 
  AND token = 'YwMWiN8h7UrvcVMGszLr4ncss0tXMJoraoBE7spDmi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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