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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44dbafbbfd278b05d80e63666b6672ad9ca570a6f5aa6cb2b614d69931c5101' 
  AND token = 'YIzrCV1/caKZfBNk8OXejUtQw0mWSqqSXdoYvYxm2TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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