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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9ff2810cc47724017b821d96ffbbeb00a6134df32aaf690542d89dc9568520' 
  AND token = 'BJOO54d0FwmL/J0wnc0FjFVDIue23l7O0fEv69Pr7z0=' 
  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"
    }
  }
}