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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d81def176d310a62654f2bda6e0a4cbf5f0e2018e758d87d862d7137c01c2d' 
  AND token = '/z4EA40tW4AT4BHEhkp4NGXiG27D5e7MB0BN8bxVauY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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