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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0744a631d72bdc057cbceac8d2a3876813f58ab43ffc852b610180a621fb33b' 
  AND token = 'fd6+7kLCcIVf4ude4+4gR5zTsLeJvEkCmIh8yWxyrlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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