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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712679c6b0a831ac0bdf983d5e20a34cd599e35094d141c8abff984de7d4c9d4' 
  AND token = 'VuatI9XosA8LD19n7v8CU4D1efjOFQwo0DIMsKNjEv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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