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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6f85670c090c6cd89e7bb23cea764d287fc11891d67834ed9c03a94034fa4b' 
  AND token = 'GGc6mH8eD+gepwNlpTpZCFfXbZfK7DgJVE4LY5OXhsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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