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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1f074571b829b80d1b203264d2751697f0b7a494460f909136725a34804660' 
  AND token = 'cs2FswpzLcU6WXmdkHdG2k3ldTDNKxKEh//ELDlXnvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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