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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac287b2128dca365892535404bdb87bc6a0527eff7732945c2e9302e9697e858' 
  AND token = 'DwpiMignDEg/BuS9DjBT10Qli4VwtQpDdz0Wd64FuQo=' 
  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"
    }
  }
}