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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ab179c57f28560f3b2ea4a9ef138a542264eebfee162398113811fdc46f343' 
  AND token = 'C3ucRsfbHcU7X2hFbQv6yIVEXa+YHc1sC5nkwSsKYds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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