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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227c686eb6b7b7732d81b2bf22935784b0960f01df2f9ac2b53ba2c6ab810d6c' 
  AND token = 'es70BbdzhvTrih4yzMKELr81NvLiaufVYcTOlTwZ/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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