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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0ac9f1f64cdac13184f73baf61424ef8bfd9cfec601c948d2adfd612e7f941' 
  AND token = 'peWq6JGUN6l28iHqoRmGG32/F9+aydX128XNctWI3lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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