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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c242fe642c584631df3a24557f31920e160640201bb9e646b6b8ef8bbed91a' 
  AND token = 'aH9sLlRf5Os/rN3bZ5lMHj2NFcXFj55ud7RVqzQR1Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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