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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1ffa9f760c9f730531003205723524fc78d4819b8ef929b941efa4d028b002' 
  AND token = 'mVHg4CLWuxBoSxQrxEHSnZazn7kMQwPCTaXFBnOu4Jc=' 
  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"
    }
  }
}