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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4974df06c2a7f27519166f8799fddff549fdfa0479b2e7f7e3e333266a1d5b7a' 
  AND token = '2qP6SnabTX9uRdEuMv+A6QDRGkNpnotFyu3Hduo+yo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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