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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de5f1ff88b662bdc3ff87145c5a0c2ca3ce93a5e77a8f55bb6e8a8249b65327' 
  AND token = 'HpVQjIsE3zh/5oNBPcRdXqkMdegbIegH6Ndfzx4tjAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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