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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc2fc1b0024a0529dfd6598d409035a36fcc36f63f43ae66ff6231187972e30' 
  AND token = 'm8JxTWFJdb7rRZ4oPFvhH+4T5HV83dtoOeg89Q80OOk=' 
  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"
    }
  }
}