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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f01bcaf5678aeaaa21cdf5990fdca1ac6c2ec18cff754dae59655b5f2ba0d7' 
  AND token = 'Y7/sghTaa14n1H+0ECpJ9KoopqPBGlCQKtNOWU59nPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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