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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc72c77453ca650b4451bdc74917d2ff52ac70dd7c959c95bdeb11b24763990' 
  AND token = 'VhEC6QGmXN9YRd9aG5Io1u20LWTjCA+Q1mBc/T9St+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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