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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963dd9981d5dd251ac9349ccc271f05ed73bcd234e0bd5295fb05c342c949ccc' 
  AND token = 'XCBbPfn6t/rxwQsTwOXQ5v/wz15cS+ZGGm3rO7hILuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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