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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4da0840027b0330c155a200898140d2cf5012ff915eceb1b14e33be4b4e5cf4' 
  AND token = 'ONNtucgFA+tWAivtr6G22Nm56z1Cwnxyyl2tq6RKOFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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