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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd821f034d8ac383e397bce370854f0de7cff46599df0bb9f1cea610f146320f8' 
  AND token = 'S1K+442xR8aa/ibDwlKI4qNDzmrC2m9TbnHbh+tsgVk=' 
  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"
    }
  }
}