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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60ac5db52f5f914a2536ede4556c4c292220eb610d47db5fe146473d931686c' 
  AND token = '9BIIm8bg3VI/mhdxNokZo6bwB5X36rQ9jA57uBA8tcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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