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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5250380bdf790e217b44a5964e44df70ada22c0422d02f6ad6de3db6bf23663' 
  AND token = '7jotC0cvf/+LK9/NMGnYf7NpLtufRw2wANttIxfgIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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