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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da63de0bcb2d3f1035b6bf208e314fa3c8dac5e1ceefd366983496fc787a506' 
  AND token = 'QakBc9Ie3Byqm0RHqFxb/o6zCYEOuHiHTjbekYHS8eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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