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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f96eaa89a34528c63ac091f2e67cc5d6fe6e4efae6b88ec2a9607982433a2c' 
  AND token = 'pGuivxR+GMIQVV2t73r/o50QN9OJKpwN1qdiWb0ZLS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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