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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bbd9b0939e05da2ec9bdcc75bdaf6da65c9b8a3e121e95c81e805720b593e3' 
  AND token = '2f3Fwpdm0VWr20Xeir8WG90xPMq57VCayLzIykR5Olw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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