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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3a48a2a50fca51015d1c819419081d43d0127b32c1b788d624a75eb0fb74bf' 
  AND token = 'xLD8bVu/bLDGufoukuUAJhLHxy7aEhQPLPaVSjoHJ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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