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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a337a080feca3e438fee7b4759b35af0a23811e56a0dc41d368d384af5b76e40' 
  AND token = 'LjUcZKTyxoTJKwJnQ1losz/V8W4vPeaSx15utZhQ8Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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