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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854993bde8982cce23f12f98b125b5a56b7747f84db9a09a66bf66c5de04264a' 
  AND token = 'DSZMntNknhdG+xL1USHADwuX9fd5uRvo5sSdFJJ9+U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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