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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cc9efd757837f7605989538bae38a5883afab4bf7f08f8e78d73195e37768f' 
  AND token = 'lvlWlahXfmxt1z8JzmcyysLw3q5e8w+9GMqCsxRIYqM=' 
  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"
    }
  }
}