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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a18d1ea151ed001b10ad845f7f3896414b422ff6aa8abe31d155fd341aad6df' 
  AND token = 'jNoNuC67zzyTrLPqpF6a6PDgxHLSTvw48axo4gJ6M+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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