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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b711f8aa5545af9cb33f50e130637329d2c6958bce5c055f7f2bb1958b7ba75' 
  AND token = 'gN22uQytZ3i4KrkabFGR4XiPrDp5Wsr3bqnsRWJ6Log=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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