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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9cbefeb7b2309858b092cc70ad2b27a039f1dba3018846cf21b2cb86199f15' 
  AND token = 'Ue0/FEn9DkRuyCtifN+1vgo7kpSUYF1l3rOozEKALyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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