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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183c21b0c6154b02419d9833df44d2af96660b4ebd5a105a36616b09f44e613c' 
  AND token = 'HJXVfhSE6o4hoM9Bwa5lCbGfvm8tNdKzVz09x7xCeNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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