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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768f8c823bf11f19da6557d1c811510508455570b1c5306e712d74ff7b8d4d33' 
  AND token = '1aTPqG5n3aDxbfqyvhCMMXI4CWlSlEv3Ocy6KoN9DK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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