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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f902e20bba4305b21d4b9661d5a8ada22aca4ca921396602fc47d1bc89b1cf' 
  AND token = 'J4aZcSGZD4c9NBqKwjod/Q9n8R05QUpiyfyGwMeYADY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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