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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5a2a227922a965df7a98b20ee3bc16480c470bf8284d4c2555d0ee891a7991' 
  AND token = 'hGMNZaTfZr9xdnhdhQS6ARF9p+1g68UcuyU9oRAS+FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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