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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea6c00072234ed6a89f084a6356f0b7b41b324f6308a0987ef785161baedd25' 
  AND token = 'fHt186wECxQsMEht2PrUJtgYomRZ63ijlQBozMwZk3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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