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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8febaa595ac8d36e1f7b05f03266d6a6c80d6c15230a4616b797bdbfaa2723' 
  AND token = 'u8QBoKWlpq4IhE+M4ejk3+6guFR0/xSdXJ3QImu3S9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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