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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f201e05e8b7f59b789b910fc62d8ed271b99f580fa7e724b46ee690f07ac45c' 
  AND token = 'Vc1kAevDtEj+TOIubu9czx4GybyMoutuWNARqdK4SiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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