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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2302b2913a4e55a0b09dcc5938d83b5f7599cd65dc55a369b0310ac7fe18841f' 
  AND token = 'itM597tum67b1333xZSYKdiHGlGn/KoD6t7qBFqoehE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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