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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c245ee418b8f72861e3ca6bd22d7c8ee503b83ed352a67ee6a60a4b501486133' 
  AND token = 'sKibOiwAqQRwds5w2buwAm92oO6ea1a4Ob2zF/wStIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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