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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a70f2ae3f53935c51ece1aeaeb7feed6f19e0be85b90a5707a4d8ccd430a64' 
  AND token = 'FW5kruLKseh/scqFxlH7idW3CYBQtimZc9Iwq+nUwWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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