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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975f3323a1ea00b000a192419ba1bd36036cce39bf8bc4edd8abf3777058834d' 
  AND token = 'FnHAN8mdXnnhJgksTKqqcbd8zjGLR3I4bEhMhQDa4jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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