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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ba18245aa89a1b3fd0c40d934c9ba6727a89e9f105f852507eea522bd9cd93' 
  AND token = 'X8+iBaKQqCO/++sGy/9DoOIl+fy/c6aRr19MeLcRFds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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