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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3bda897bb7f0398d1d80f7ec523918c9cfce55ec08707ee014c7a87b26181c' 
  AND token = '47zbM40oPFx6nWtQmsR47W+QprlM4R6xYNK8OZK0pKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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