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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de7919915d98ad1c90e170cb1e22a1732b16ea537fc431bb2f279b2795d8dcc' 
  AND token = 'XNzbbptfy40hpKhWgurhmqozZI3Sg1Js+t0+KsQ6zO0=' 
  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"
    }
  }
}