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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa33b9ad3f216874f52feaaa9887aa640a117ac1818657f088270cdb66e8036' 
  AND token = '+xjqhqwWyBScDNxhqO1Iam3p4VqyE0dq5pK2tofept8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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