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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90c5a6aa599b7f48235eb202a2943f451df7522da2dbcdba171846d3ee57e76' 
  AND token = 'b9MEk4DNPYWWtfZj0Xbljwkyznw26jxp8H8xl7yW9dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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