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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873b851ea3b3fd32eea105d305df3c32037c85b2ea0022db5dca3c462f76c39f' 
  AND token = 'GTxEaeG/0dC8BQMW52tZu6AnQqzlU+ADRgzMToOPm6I=' 
  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"
    }
  }
}