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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3000f20dc2750ce19e609228a8562ba3a897e9f750722b0e1ee91fec11390b' 
  AND token = 'Y+G7S9sOChkmK8b2n0wuyscrYOPZWVC8HjgBtxpcP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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