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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0829e7eec58c5a21d9931d5d9522c731f98707cc840e304aa10539ce4f9afe39' 
  AND token = 'ehpDQ9DQrEJO3Sf/+crl+On6iNuaucklJoFIKnSlEXA=' 
  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"
    }
  }
}