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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a11a5a9b66d5981c931063054ef89eccc7c2a946660b39983eb76c5b121e38' 
  AND token = 'KDDad4BFIE0o5FUVNtjxbEfj7AXOy/Qadni1wnZaxo8=' 
  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"
    }
  }
}