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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e91eb2e6ad22fe61ed31fb12acf354793925a90b400b5ab4446c2d96db33202' 
  AND token = 'epF1jvyrQNbZHt4lhsdLNKK+22UfKyWQem4Bm7P5fFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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