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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc777f4ee9da307e56d4f19b1f570fa9e556c3a7fba055c65df3b373b5574e8' 
  AND token = 'z1WdRcydSC8RSO0OfBcqaP4bdDfLkKXipilfvMpVQH8=' 
  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"
    }
  }
}