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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a97399df3a0832aeb8e308c8a8d5e0bc2e54e23dc5c6be64002f082089fea5' 
  AND token = 'rQsY6tyvNXMiw3YqCAUd/DDomN/BAKwMup+95vrM4e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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