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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09998f7855874165aefc44d03158e7eea74116928a9909371ccf9f0905e87a7b' 
  AND token = '7TNhhw9sN9k1njCWCmgwPEQJkm4LFYE0yMEBxmF4TOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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